#define  _CRT_SECURE_NO_WARNINGS 1

#include<iostream>
using namespace std;

namespace bit
{
	int a = 10;
	int b = 2;
}

int& Add(int a, int b)
{
	int c = a + b;
	return c;
}
int main()
{
	int& ret1 = Add(1, 2);
	int& ret2 = Add(3, 4);
	cout << "Add(1, 2) is :" << ret1 << endl;
	cout << "Add(3, 4) is :" << ret2 << endl;
	return 0;
}